Use a waterproof case, or waterproof video recording device. Attach the suction cups to glass/smooth tiles in the pool, or use the open hooking end with a rope or string. Get creative and you can get any amazing shot you can dream up.

I remember doing this as a kid, not synchronised with women of course, just on my own or with a friend..... http://stores.ebay.co.uk/bewilderbugs/ https://www.facebook.com/bewilderbugspage https://twitter.com/BewilderBugs https://plus.google.com/u/0/b/108070750963268379060/108070750963268379060/posts https://www.youtube.com/user/BewilderBugs